Annual report pursuant to Section 13 and 15(d)

Marketable securities (Details)

v2.4.0.6
Marketable securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Marketable securities    
Cost $ 4,422 $ 5,394
Market value 4,411 5,375
Unrealized gain (loss) (11) (19)
Cost of investments by rolling maturity    
Due in one year or less 4,422 5,394
Estimated fair value of investments by rolling maturity    
Due in one year or less 4,411 5,375
Certificates of deposit
   
Marketable securities    
Cost 4,422 5,394
Market value 4,411 5,375
Unrealized gain (loss) $ (11) $ (19)